[classes] Auto mapping `Date` from `null` resolves to `undefined` wrongly

[micalevisk]

Is there an existing issue for this?

• [X] I have searched the existing issues

Describe the issue

When using @AutoMap({ typefn: () => null }) for some field that could be Date | null, the destination end up with undefined instead of null

I believe this is a bug because this doesn't happen in v8. But this also could be a limitation, I'm unsure.

Models/DTOs/VMs

class Foo {
  @AutoMap({ typeFn: () => Number })
  someNumber: number | null
  @AutoMap({ typeFn: () => Date })
  someDate: Date | null
}
class FooVm {
  @AutoMap()
  someNumber?: number
  @AutoMap()
  someDate: Date | null
}

Mapping configuration

const mapper = createMapper({
  name: '',
  pluginInitializer: classes,
})
mapper.createMap(Foo, FooVm)

// ...
const foo: Foo = {
 someDate: null,
 someNumber: 123,
}
const fooVm = mapper.map(foo, FooVm, Foo)
console.log(fooVm)
/*
FooVm { someNumber: 123, someDate: undefined }
*/

Steps to reproduce

No response

Expected behavior

mapper.map(foo, FooVm, Foo) should return:

FooVm { someNumber: 123, someDate: null }

because we're reyling on AutoMap

Minimum reproduction code

https://replit.com/@micalevisk/automapper

Package

• [ ] I don't know.
• [ ] @automapper/core
• [X] @automapper/classes
• [ ] @automapper/nestjs
• [ ] @automapper/pojos
• [ ] @automapper/mikro
• [ ] @automapper/sequelize
• [ ] Other (see below)

Other package and its version

No response

AutoMapper version

7.3.14

Additional context

No response